Saw-sharpening device



March 26, 1940. OM 2,194,464

SAW-SHARPENING DEVI GE Filed Nov. 8, 1957 \MMMMMMMMMM 1.x .nnnnnnnnmnnnugg gggg INVENTOR r0111 40 4/ Hen! 7770/7743 37 ATTORNEY Patented Mar.26,194( I t 7 2,194 4 4,

'UNI'TED STATES PATENT OFFICE a I 2,194,464 i v SAW-SHARPENING DEVICE Henry 0. Thomas, Kansas City, Mo. Application November 8, 1937-, Serial No. 173,339 teams. (01. 'zs-eey This invention relates to saw-sharpening dethe handle and having means for operating on vices and more particularly to a device of that one end of the file, said post having a lateral ex-'- character comprising a file or the like mounted tension 5 provided with a post 6 having an adin a frame or other member whereby the file may lusting chan sm 1 mounted thereon for ad- 5 be reciprocated relative to the teeth of a saw i y mounting the Other end 'O the e A I for sharpening th aw, device 8 is also provided on the extension 5 in The' principal objects of the present invention Spaced relation to the ends thereof for mounting are to provide a saw-sharpening device which an adjusta Sight gauge 9 for aligning e may be reciprocated at a constant angle relative frame in proper relation to the teeth of 3 Saw 10 to the teeth of a saw and wherein the file thereof to be sharpened. I o 10 may be variably canted to present-the proper The handle I isparticularly illustrated in Fig. angle of the file relative to the teeth of the saw 4 and prefe y consistslof a ripp n m m r for obtaining the proper pitch and cutting angles t p v ded W a central bore at the inner end of inclinatign for th t th f th thereof for seating a lug I i extending rearwardly 5 Other important objects of the present inventhereinto o the 1 st e lug H e150 p 15 tion are to provide means within the frame for; Vided h a o 12 r receiving the tang end mounting the file whereby the file may be cen- 0f the fi e The p 4 is Provided W h tered relative thereto; to provide means in the recess extending a y o the front face frame for canting the file and maintaining same 14 thereof in Which Sleeve or g Of 9 Suitable in properly canted position; to provide for mountr l is mounted, p brass ring 20 ing the file in such a manner as to protect it Whichis preferably p sed into the c the against breakage; to provide means on the frame ng in turn being p v ded W tha bore which whereby the device may be maintained in aligntapers inwardly o t e Outer face thereof ment with the saw; to provide means foradjustand terminates at the surface of the bore in the ing the aligning means whereby the proper angle i-l' v i of the complete device relative'to the longitudi- The upper end o the P 4 is P d th nal plane of the saw maybe maintained in opera Substantially u ar h we y extending ating same for obtaining t proper angles of lug 16 which terminates in the extension 5. the sharpened teeth; and to provide constant Formed yw th e P t 4 in downwardly a0 adjustments for the file and frame relative to spaced relation to h p u 6 is a forwa ly nrn'th extending lug H, the lugs I6 andl'l being prom aooomphshihg th and other obje ts of vided with aligned substantially vertical bores the present invention, I have provided improved for receiving a t d s a as particularly details of structure, the preferred form of which Shown in Fig. The threaded pp e d o the is u t t d in t accompanying drawing, shank i8 is mounted in a knurled nut or the like 35 wherein; it and on its'lower end is mounted a block 20 of Fig 1 s perspective w of a saw ha,rpen a material preferably harder than the rest of the ing device embodying the features of the present Structure, for P ,'t Dered Steel. The uninvention, which is shown as it is being applied der face f the block is adapted o be n a ed 40 to a aw f r sharpening same I by certain of the corners of the file 3 when the 40 Fig 2 is a detail perspective View of t file is turned in its mounting as later described, j t 1 1 support, for one end of t fi1e for retaining the file in set position after the file Fig. 3 is a vertical cross-section on the line has been adjusted- Alock nut 2| is o u ed 3 3 Fig 1 onthe threaded shank 18 within the space 22 Fig. 4 is a vertical fragmentary 'cross-sectio between the s l6 a d w y, W en e through a portion of the handle member illusblock 29 is adjusted manipulation of the nut trating th t for th tang d of th file; l9, such block may be locked in desired position Fig. 5 is a vertical cross-section through the file by turning the n 2| 0n he shank to contact aligning device taken on the line 5-5, Fig. 1. theun'der face of the lug I5. Fig. 6 is a plan view partly in cross-section The mechanism 7 for adjusting the length 0f through the saw aligning device. the framerelative to the file 3 preferably con- Referring more in detail to the drawing: sists of -a boss 23 on the downwa d y eXtehdirlg The present invention generally consists of a post- B,'which boss is provided with longitudinally frame having a handle I provided with a seat 2 extending ends 24 preferably extending in par-. for one d of a file 3, a post. 4 being mounted on: allel relation to the extension 5 as particularly 55 shown in Fig. 2. The boss 23 is provided with a central bore through which a screw is inserted,

which screw is provided with a pair of lock nuts 26 and 21 at the opposite ends of the boss 23. The screw 25 has an enlarged inner head 28 provided with a central bore 29 and a counter bore 313. A sleeve or ring 35 of relatively soft material, preferably formed of soft brass or the like, is mounted, as by pressing, in the counter bore of the head 28 for receiving the tip end 32 of the file 3, the ring preferably being retained in position in the counterbore by a fastening device such as the set screw 33. The enlarged head 28 of the screw 25 is preferably knurled to facilitate hol ing the screw relative to the boss 23 for adjusting the frame as to length relative to the file and for gripping the file within the ring 3| at the inner end of the screw. For example, when it is desired to shorten the space between the posts t and 6 for gripping the file the lock nut 28 may be gripped and the nut 21 or head 28 turned in an anti-clockwise direction to draw the screw 25 to the right or toward the post 4, thehead 28 may then, be held and the lock nut 2'5 threaded back into engagement with the boss 23 to retain the screw in adjusted position.

The device 3 for aligning the frame, as distinguished from the file, relative to a saw to be sharpened, preferably consists of a block 34, as particularly shown in Figs. 5 and 6, preferably integrally mounted on the extension 5. The block 34- is provided with a central vertical bore for pivotally receiving a threaded shank 35 mounted on a boss 36, the shank 35 being provided with threads on its lower end for receiving overhangs the block 34 and which is preferably of substantially the form of the head portion 38, the member 39 being joined to the head portion as shown in spaced relation to a side face of the block when the shank 35 is mounted thereon.-

The overhanging member 39 is provided with a bore for receiving a threaded pin 40 having a knurled head 4!. A look nut 42 is also provided on the pin 4!] between the head ll and the outer face of the member 39 whereby the pin may be locked in position when adjusted relative to the block 3 by rotating the head 4! to draw it toward or away from the member 39.

In operating a device constructed as described, the tang end of a conventional three-cornered file is mounted in the handle II] in such a manner that the body portion of the file adjacent said tang end is engaged in the soft ring 15. The head is then moved toward the handle to. effect engagement of the tip end of the file in the soft ring 3|.

The file may then be placed between adjacent teeth of a saw to be sharpened for aligning the face of the file employed for cutting with the cutting edge of one of said adjacent saw teeth. The cutting face of the file being so arranged, the file is then fixed in said position by manipulation of the lock nuts 26 and 21. The block 20 is then lowered into engagement with the uppermost corner of the file, as shown at 43 in Fig. 3, and locked in such position by the lock nut 2 I. The file is then set.

' The cutting angle of the edges of the teeth, as

9 in parallel relation to the longitudinal plane of the saw. The pin 40 is then threaded into engagement with the block 34 and the gauge bar 9 is thus set.

The operator may then sharpen alternate teeth of the saw beginning with the first tooth, for exfor the edges of the teeth by sighting against the gauge bar and saw to maintain both inparallel relation while the file i'sreciprocated to sharpen the teeth.

In sharpening alternate teeth of the saw beginning with the second tooth, it is sometimes desirable to reverse the frame, and in so doing the angle of the cutting face of the file is reversed relative to the teeth to be sharpened. The lock nuts 26 and 2'! should then be loosened and the file rotated axially'to the right, as in Fig. 3, andv as limited by the block 20, to reverse the cutting angle, the angle in its new position corresponding to the desired first angle but in reverse relation thereto.

With the frame and file reversed, it is neces-' sary to also reverse the gauge bar 9. This is accomplished by merely loosening the lock nut 3'1 and rotating the boss, for example in a clockwise direction from the position shown in Fig. 6, as far as possible as limited by engagement of the pin ll with the block 3%. 'I'he'lock nut 31 is then tightened and the gauge bar is set in reversed relation to its original position and in corresponding relation to the new position of the file and frame.

The operation may then be resumed to sharpen the second alternate series of teeth tocomplete' the sharpening operation on the saw.

By this expedient, the operator of the device, in reciprocating the file to sharpen the teeth of the saw, may maintain the frame in adjusted alignment with the saw by merely watching the position of the bar relative to the saw, 1. e., by

keeping the bar in parallel relation to the axis or plane of the saw during the filing or sharpening operation. Further, the cutting edges of the saw may be given the proper angles and pitches by simply adjusting the file in the frame.

The principal advantages of a device of the character described, over others heretofore availadjustments may easily be made for the angle at which the device is to be operated relative to the longitudinal axis or plane of the saw.

What I claim and desire to secure by Letters Patent is:

1. In a saw sharpening device, a frame, means 70 on the frame for mounting opposite ends of a file, a file, a member pivotally mounted on said frame, a gauge bar mounted in said member substantially transversely of said frame, adjustable means on said member alternately engageable 75,

15 ample, and maintains the proper cutting angle with spaced portions of said frame respectively while in one adjusted position of said adjustable means upon pivoting said member in opposite directions for reversibly angularly positioning said gauge bar relative to said frame, and means for fixing'said member and adjustable means in pivoted frame engaging position.

- 2. In a device of the character described, a file, a frame, a seat on the frame mounting one end of the file, said file being rotatable relative to said seat on the longitudinal axis of the file for adjusting a face of the file relative to a tooth of in adjusted position relative to another tooth 10 of said saw.

' HENRY C. THOMAS.

a saw to be sharpened, a setting member on the 

